Effect of statistics of small numbers on the chemistry of trace species in atmospheric particles

Details Effect of statistics of small numbers on the chemistry of trace species in atmospheric particles Effect of statistics of small numbers on the chemistry of trace species in atmospheric particles

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3209m&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 24, p. 3209-3212

Physics

1

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

In models of reactions occurring in atmospheric aerosol particles, calculated concentrations of some trace species often imply fractions of a molecule per particle. When this occurs, averaging rate or equilibrium expressions over a large number of particles gives results that differ from bulk solution. Two different effects are demonstrated here. In the first, the confinement of ions in submicrometer drops suppresses the dissociation of weak acids and bases relative to bulk solution. For free radicals, there is an isolation effect that suppresses radical chain termination reactions when radical concentrations are low. Under extreme non-equilibrium conditions, half the drops contain one radical, even when bulk solution calculations indicate a concentration orders of magnitude smaller. This can greatly enhance the rates of radical chain reactions in drops relative to bulk solution. This latter effect has the potential to dramatically alter modelled rates of reactions in atmospheric particles.

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